Lakes (Midwest Conservation Blueprint 2026 Indicator)

Definition This indicator represents lake health based on watershed condition within the Midwest Landscape. It prioritizes lakes and reservoirs greater than one hectare based on the amount of agriculture and development in a lake's upstream watershed. Pixels can take the following values: 1 – Lake or reservoir with high disturbance (>60%) in upstream watershed. 2 – Lake or reservoir with medium disturbance (>25-60%) in upstream watershed. 3 – Lake or reservoir with low disturbance (0-25%) in upstream watershed. Selection This indicator was chosen as a targetable, important feature of the MLI goals that will be used to track conditions over time and prioritize areas for conservation. Indicators were defined through elicitation and prioritization exercises with federal and state participants. Criteria for the indicators includes 1) actionable, 2) measurable, 3) relevant to multiple groups across the region, and/or 4) representative of other social and/or environmental values. Input Data & Mapping Steps This indicator originates from the LAGOS-US dataset, the National Land Cover Database, and Lapierre et al. Continuous Lake Classifications. To create this layer, MLI partners, members, and staff completed the following mapping steps: projected all input data to NAD83 (2011) UTM Zone 15N, joined LAGOS polygons with the Continuous Lake Classifications table, and converted the polygon layer to a raster based on the total percentage of agriculture and development in each lakeshed. We reclassified the raster into the following classes: 1 - Lake or reservoir with high disturbance (>60%) in upstream watershed, 2 - Lake or reservoir with medium disturbance (>25-60%) in upstream watershed, and 3 - Lake or reservoir with low disturbance (0-25%) in upstream watershed. Finally, we removed highly altered areas using our Highly Altered Areas mask. For full mapping details, please refer to the Midwest Conservation Blueprint Development Process. For a complete download of all Blueprint input and output data, visit the Midwest Conservation Blueprint 2026 Data Download.## 定义 本指标基于中西部景观（Midwest Landscape）内的流域状况表征湖泊健康水平，优先针对上游流域受农业活动与开发活动影响的面积大于1公顷的湖泊与水库。其像素可取值如下： 1. 上游流域受干扰程度较高（干扰占比>60%）的湖泊或水库； 2. 上游流域受干扰程度中等（干扰占比>25%~60%）的湖泊或水库； 3. 上游流域受干扰程度较低（干扰占比0%~25%）的湖泊或水库。 ## 指标选取依据 本指标被选为MLI目标中具备可靶向追踪性的关键特征，将用于长期追踪流域状况并优先划定保护区域。指标通过面向联邦与州级参与者开展的征询与优先级排序研讨活动确定。指标选取标准包括：1）具备可操作性；2）可量化；3）与区域内多类群体相关；及/或4）可代表其他社会与/或环境价值。 ## 输入数据与制图流程 本指标源于LAGOS-US数据集（LAGOS-US dataset）、美国国家土地覆盖数据库（National Land Cover Database）以及拉皮埃尔等人（Lapierre et al.）的连续湖泊分类数据集（Continuous Lake Classifications）。为生成本图层，中西部保护蓝图的合作方、成员与工作人员完成了以下制图步骤：将所有输入数据投影至NAD83（2011）UTM 15N带坐标系；将LAGOS多边形矢量图层与连续湖泊分类表进行属性关联；基于每个湖泊流域内农业与开发活动的总占比，将多边形矢量图层转换为栅格图层。随后将该栅格重分类为以下类别：1 - 上游流域受干扰程度较高（>60%）的湖泊或水库，2 - 上游流域受干扰程度中等（>25%~60%）的湖泊或水库，3 - 上游流域受干扰程度较低（0%~25%）的湖泊或水库。最后，通过高干扰区域掩码（Highly Altered Areas mask）移除了受严重扰动的区域。如需获取完整制图细节，请参考《中西部保护蓝图编制流程》（Midwest Conservation Blueprint Development Process）。如需下载全部蓝图输入与输出数据，请访问《2026年中西部保护蓝图数据下载》（Midwest Conservation Blueprint 2026 Data Download）页面。